EP 0875107 A1 19981104 - CODING PROCESS FOR INSERTING AN INAUDIBLE DATA SIGNAL INTO AN AUDIO SIGNAL, DECODING PROCESS, CODER AND DECODER
Title (en)
CODING PROCESS FOR INSERTING AN INAUDIBLE DATA SIGNAL INTO AN AUDIO SIGNAL, DECODING PROCESS, CODER AND DECODER
Title (de)
CODIERVERFAHREN ZUR EINBRINGUNG EINES NICHT HÖRBAREN DATENSIGNALS IN EIN AUDIOSIGNAL, DECODIERVERFAHREN, CODIERER UDN DECODIERER
Title (fr)
PROCEDE DE CODAGE POUR INTRODUIRE UN SIGNAL DE DONNEES NON AUDIBLE DANS UN SIGNAL AUDIO, PROCEDE DE DECODAGE, CODEUR ET DECODEUR CORRESPONDANTS
Publication
Application
Priority
- DE 19608926 A 19960307
- DE 19640814 A 19961002
- DE 19640825 A 19961002
- EP 9700338 W 19970124
Abstract (en)
[origin: US6584138B1] In a coding method and a coder for introducing a non-audible data signal into an audio signal, the audio signal is first transformed to a spectral range and the masking threshold of the audio signal is determined. A pseudo-noise signal and a data signal are provided and multiplied with each other so a to provide a frequency-spread data signal. The spread data signal is weighted with the masking threshold, and thereafter the audio signal and the weighted data signal are superimposed. In a method and a decoder for decoding a data signal introduced into an audio signal in non-audible manner, the audio signal is first sampled and thereafter the sampled audio signal is filtered in non-recursive manner. The filtered audio signal is subsequently compared to a threshold value so as to retrieve the data signal.
IPC 1-7
IPC 8 full level
H04H 20/31 (2008.01)
CPC (source: EP US)
H04H 20/31 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE
DOCDB simple family (publication)
US 6584138 B1 20030624; AT E184140 T1 19990915; EP 0875107 A1 19981104; EP 0875107 B1 19990901; WO 9733391 A1 19970912
DOCDB simple family (application)
US 14232598 A 19981005; AT 97902223 T 19970124; EP 9700338 W 19970124; EP 97902223 A 19970124